Chromosomal stabilisation by a subtelomeric rearrangement involving two closely related Alu elements

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Abstract

We have characterised a subtelomeric rearrangement involving the short arm of chromosome 16 that gives rise to α-thalassaemia by deleting the major, remote regulatory element controlling α-globin expression. The chromosomal breakpoint lies in an Alu family repeat located only ~ 105 kb from the 16p subtelomeric region. The broken chromosome has been stabilised with a newly positioned telomere acquired by recombination between this 16p Alu element and a closely related subtelomeric Alu element of the Sx subfamily. It seems most likely that this abnormal chromosome has been rescued by the mechanism of telomere capture which may reflect a more general process by which subtelomeric sequences are normally dispersed between chromosomal ends.

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Flint, J., Rochette, J., Craddock, C. F., Dodé, C., Vignes, B., Horsley, S. W., … Higgs, D. R. (1996). Chromosomal stabilisation by a subtelomeric rearrangement involving two closely related Alu elements. Human Molecular Genetics, 5(8), 1163–1169. https://doi.org/10.1093/hmg/5.8.1163

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